Rinnai CHS398100CUiP Operating instructions

Category
Water heaters & boilers
Type
Operating instructions

This manual is also suitable for

Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
1-800-621-9419 rinnai.us
If the informaon in these instrucons is not followed exactly, a re or explosion
may result causing property damage, personal injury, or death.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call your gas supplier from a neighbors phone. Follow the gas suppliers instrucons.
If you cannot reach your gas supplier, call the re department.
Installaon and service must be performed by a qualied installer, service agency or the gas supplier.
WARNING WARNING
2 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
1. Welcome ......................................................... 3
2. Safety .............................................................. 4
Safety Symbols .................................................... 4
Safety Precauons .............................................. 5
3. About ............................................................. 6
Components ........................................................ 6
Specicaons ...................................................... 7
Recovery Capabilies .......................................... 7
Dimensions .......................................................... 8
4. Installaon Preparaon ...................................... 9
Installaon Guidelines ........................................ 9
Installaon Illustraons .................................... 10
Conrm Shipping Contents ............................... 11
Gather Tools and Materials .............................. 12
Determine Locaon and Clearances ................. 12
5. Installaon Instrucons ................................. 14
Step 1: Transport .............................................. 14
Step 2: Secure for Earthquake .......................... 14
Step 3: Posion Tank and Connect Water ........ 15
Step 4: Install Rack Frame Legs ......................... 16
Step 5: Posion Rack ......................................... 17
Step 6: Install Water Flex Lines ......................... 18
Step 7: Connect Thermistor .............................. 19
Step 8: Secure Rack ........................................... 20
Step 9: Install Vent System ............................... 21
Step 10: Install Relief Valve Lines ..................... 21
Step 11: Fill System with Water ........................ 23
Step 12: Connect Condensate Drain Line ......... 24
Step 13: Connect Gas Supply ............................ 25
Step 14: Connect Power Supply ........................ 26
Post-Installaon Checklist ................................. 28
6. Maintenance ................................................. 29
Storage Tank Anodes ........................................ 29
Storage Tank ..................................................... 29
7. Appendices ................................................... 30
Piping Diagram for Basic Installaons .............. 30
Controller Diagnoscs ....................................... 31
Panel Assembly ................................................. 32
Replacement Parts ............................................ 33
Limited Warranty for SE+ Series Models .......... 35
Notes ................................................................. 37
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 3
Contact your local dealer/distributor or call Rinnai
Customer Care at:
1-800-621-9419
Please have your full serial number or model number
available for product- or service-related issues.
Thank you for purchasing Rinnais Demand Duo 2™
Commercial Hybrid Water Heang System.
This manual provides informaon on the installaon,
operaon, and maintenance of the system. Read this
manual completely before installing or operang the
system.
This manual is a supplement to the Installaon and
Operaon Manual for Commercial CU199 Condensing
Tankless Water Heaters; refer to the CU199 manual for
complete water heater informaon.
A trained and qualied professional must install the
system, inspect it, and leak test it before use. The
warranty will be voided due to any improper
installaon.
The trained and qualied professional should have
skills such as:
Gas line sizing
Connecng gas lines, water lines, valves, and
electricity
Knowledge of applicable naonal, state, and
local codes
Installing venng through a wall or roof
Training in installaon of tankless water heaters.
Training on Rinnai Tankless Water Heaters is
accessible at www.trainingevents.rinnai.us.
Read all instrucons in this manual before installing
the system. The system must be installed according
to the exact instrucons in this manual.
Proper installaon is the responsibility of the
installer.
When installaon is complete, leave this manual
with the system or give the manual directly to the
consumer.
1
You must read the enre manual to properly
operate the system and to have regular
maintenance performed.
Keep this manual for future reference.
As when using any appliance generang heat, there
are certain safety precauons you should follow. See
the Safety Precauons secon for detailed safety
precauons.
Be sure your water heater is installed by a licensed
installer.
If installing in the state of Massachuses, you must
read the Massachuses State Gas Regulaons
secon in the Installaon and Operaon Manual for
Commercial CU199 Condensing Tankless Water
Heaters (supplied with the Demand Duo 2™ system).
For Your Records
Dealer Name:
Dealer Phone #:
Purchase Date:
Demand Duo 2™ Serial #:
Rack Serial #:
Demand Duo 2™ Serial #
and Rack Serial # located
on side of rack frame leg.
4 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
If the informaon in these instrucons is not followed exactly, a re or explosion may result causing property
damage, personal injury, or death.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call your gas supplier from a neighbors phone. Follow the gas suppliers instrucons.
If you cannot reach your gas supplier, call the re department.
Installaon and service must be performed by a qualied installer, service agency or the gas supplier.
The warning signs in this manual are here to prevent injury to you and others. Please follow them explicitly.
WARNING
Indicates an imminently hazardous
situaon which, if not avoided, will
result in personal injury or death.
Indicates a potenally hazardous
situaon which, if not avoided,
could result in personal injury or
death.
Indicates a potenally hazardous
situaon which, if not avoided,
could result in minor or moder-
ate injury. It may also be used to
alert against unsafe pracces.
Safety alert symbol. Alerts you to potenal
hazards that can kill or hurt you and others.
DANGER
CAUTION
WARNING
This manual contains the following important safety symbols. Always read and obey all safety messages.
2
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 5
Before operang, smell all around the appliance area
for gas. Be sure to smell next to the oor because
some gas is heavier than air and will sele on the
oor.
Keep the area around the appliance clear and free
from combusble materials, gasoline, and other
ammable vapors and liquids.
Combusble construcon refers to adjacent walls and
ceiling and should not be confused with combusble
or ammable products and materials. Combusble
and/or ammable products and materials should
never be stored in the vicinity of this or any gas
appliance.
Always check the water temperature before entering a
shower or bath.
To protect yourself from harm, before performing
maintenance:
Turn o the electrical power supply by unplugging
the power cord or by turning o the electricity at
the circuit breaker. (The temperature controller
does not control the electrical power.)
Turn o the gas at the manual gas control valve.
Turn o the incoming water supply.
Use only your hand to turn the manual gas control
valve. Never use tools. If the manual gas control
valve will not turn by hand, do not try to repair it;
call a trained and qualied professional. Force or
aempted repair may result in a re or explosion.
Do not use this appliance if any part has been under
water. Immediately call a licensed professional to
inspect the appliance and to replace any part of the
control system and any manual gas control valve
which has been under water.
Do not use substute materials. Use only parts
cered for the appliance.
Should overheang occur or the gas supply fail to shut
o, turn o the manual gas control valve to the
appliance.
Only trained and qualied professionals are permied
to adjust parameter sengs.
Do not use an extension cord or adapter plug with this
appliance.
Any alteraon to the appliance or its controls can be
dangerous and will void the warranty.
Proper venng is required for the safe operaon of
this appliance.
Flammable liquids such as cleaning solvents, aerosols,
paint thinners, adhesives, gasoline and propane must
be handled and stored with extreme care. These
ammable liquids emit ammable vapors and when
exposed to an ignion source can result in a re
hazard or explosion. Flammable liquids should not be
used or stored in the vicinity of this or any other gas
appliance.
DO NOT operate the water heater without the front
panel installed. The front panel should only be
removed for service/maintenance or replacing internal
components.
BURN HAZARD. Hot exhaust and vent may cause
serious burns. Keep away from the water heater. Keep
small children and animals away from the water
heater.
Hot water outlet pipes leaving the water heater can be
hot to touch.
Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any other
appliance.
Install the vent system per local and naonal codes.
Do not install this water heater above 10,200
(3,109 m).
Do not obstruct combuson air to the water heater.
Failure to properly vent this appliance can result in
death, personal injury and/or property damage.
Rinnai recommends that every home have a carbon
monoxide (CO) alarm in the hallway near bedrooms in
each sleeping area. Check baeries monthly and
replace them annually.
California law requires the following Proposion 65
warning to be provided:
For proper installaon, operaon and safety, it is important to follow the instrucons and adhere to the safety
precauons shown throughout this manual. The following precauons apply to the installer and consumer.
WARNING
DO NOT adjust the internal gas valve. The design is such that adjustment is not
required. Warranty will be voided if the internal gas valve is adjusted.
This product can expose you to chemicals including
lead, lead compounds and carbon disulde which
are known to the State of California to cause cancer,
birth defects or other reproducve harm. For more
informaon, visit www.P65Warnings.ca.gov.
WARNING
6 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
The Demand Duo 2™ Commercial Hybrid Water Heang System pairs a 119-gallon storage tank with two pre-installed
Rinnai SENSEICondensing Tankless Water Heaters.
Controller
Box
Low Voltage Thermistors
Power Supply
Pump Control
3
Hot Water Outlet Connecon
Cold Water Inlet Connecon
Recovery Pump and Isolaon Valves
119-Gallon Storage Tank
2-Unit Tankless Rack System
Hot and Cold
Water Manifolds
Gas Line
Securing Bracket
Anode Rod Locaons (le and right side)
Electrical Assembly
Controller Box
Temperature and
Pressure (T&P) Relief
Valve
Drain Valve
DO NOT USE THIS OUTLET
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 7
U.S. Gallons / HR Liters / HR at Temperature Rise Indicated
Tank
Capacity
°F 30 40 50 60 70 80 90 100 110 120 130 140
°C 17 22 28 33 39 44 50 56 61 67 72 78
119 U.S. Gal. GPH 1,528 1,147 917 764 655 573 510 459 417 382 353 328
450 Liters LPH 5,784 4,342 3,471 2,892 2,479 2,169 1,931 1,738 1,579 1,446 1,336 1,242
Model Number CHS398100CU
Dimensions (Assembled) in. (mm) w x h x d: 38.81 x 69.60 x 40.96 (985.8 x 1,767.8 x 1,040.4)
Weight
Rack (with 2 Tankless Water Heaters): 220 lbs (100 kg); Tank: 310 lbs (141 kg)
Complete System: 530 lbs (240 kg)
Installaon Type Internal (Indoor) Commercial Applicaons
Category and Ignion System Category IV, Direct Electronic Ignion
Gas Consumpon Btu/h (kW/h) Minimum: 30,400 (9) Maximum: 398,000 (116.6)
Water Supply Pressure 150 PSI (Maximum)
Thermal Eciency (CU199) 97%
Temperature Seng 98° F (37° C) to 185° F (85° C)
Tank Volume 119 Gallons (450 Liters)
First Hour Delivery* 543 Gallons (2,055 Liters)
Sound Level 49 dB
Electrical Data
(CU199 Tankless Water Heater)
Normal: 265 W, Standby: 44 W, Freeze Protecon: 148 W, Max Current: 5.5 A
Fuse: Tankless Water Heater Engine: 10 Amps, Controller: 10 Amps
Natural: 3.5 - 10.5 in. w.c. Propane: 8.0 - 13.5 in. w.c. Gas Supply Pressure**
By-Pass Flow Control Electronic
Connecons
Gas Supply Inlet: 1-1/2 in. MNPT Hot Water Outlet: 1-1/2 in. MNPT
Cold Water Inlet: 1-1/2 in. MNPT
Electric Connecons
Appliance: AC 120 Volts, 60Hz.
Integrated Temperature Controller: DC 12 Volts (Digital)
Water Flow Control Water Flow Sensor, Electronic Water Control and Bypass Control
Water Temperature Control Simulaon Feed Forward and Feedback
Recovery 459 GPH @ 100° T
High Altude Approved Up to 10,200 Ft (3,109 M)
Complies with South Coast Air Quality
Management District 14 ng/J or 20 ppm NOx
Emission Levels (CU199i)
Yes
Ultra Low NOx Yes
Cercaons AHRI, ANSI Z21.10.3, CSA 4.3 and Commercial ENERGY STAR® Cered (CU199i)
Controller MCC-91-2US
Recirculaon Pump Grundfos UPS 26-150 (S)F; 3 Speed
Venng Material Polypropylene, PVC
Venng Opons
Concentric Polypropylene, Twin Pipe, or Common Vent Polypropylene/PVC/
CPVC. Vent lengths up to 150 .
Wi-Fi Ready Yes
* First Hour Delivery Rang is a theorecal calculaon based on 70% usable tank capacity.
Tank Capacity x .70 + (recovery) = First Hour Rang
** Maximum gas supply pressure must not exceed the value specied by the manufacturer.
8 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
LEFT
*Temperature and Pressure Relief Valve
58.55 in.*
(1,487 mm)
44.21 in. (1,123 mm)
42.71 in. (1,085 mm) GAS
38.81 in. (986 mm)
20.50 in.
(521 mm)
5.91 in. (150 mm)
Typical
Ø 28.16 in.
(715 mm)
23.75 in.*
(603 mm)
* Temperature and Pressure Relief Valve
42.79 in. (1,087 mm)
38.92 in. (989 mm)
Gas
Vent
44.28 in. (1,125 mm)
4.14 in.
(105 mm)
Cold
3.61 in.
(92 mm)
Drain
67.31 in. (1,710 mm)
Building Electric
65.77 in. (1,671 mm) PVC/PP
66.35 in. (1,685 mm) Tank Height
34.02 in. (864 mm)
64.49 in. (1,638 mm) Concentric Vent
68.94 in. (1,751 mm) Hot
Gas
RIGHT
FRONT
TOP
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 9
THIS SECTION IS INTENDED FOR THE INSTALLER
Installer qualicaons: A trained and qualied professional must install the appliance, inspect it, and leak test the
Demand Duo 2™ before use. The warranty will be voided due to any improper installaon. The trained and qualied
professional should have skills such as: Gas sizing; Connecng gas lines, water lines, valves, and electricity; Knowledge
of applicable naonal, state, and local codes; Installing venng through a wall or roof; and training in installaon of
tankless water heaters. Training for Rinnai Tankless Water Heaters is accessible online at www.trainingevents.rinnai.us.
This water heater is suitable for combinaon water
heang and space heang and not suitable for space
heang applicaons only.
The installaon must conform with local codes or, in
the absence of local codes, with the Naonal Fuel
Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas
and Propane Installaon Code, CSA B149.1.
The appliance, when installed, must be electrically
grounded in accordance with local codes or, in the
absence of local codes, with the Naonal Electrical
Code, ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.1.
The appliance and its main gas valve must be
disconnected from the gas supply piping system
during any pressure tesng of that system at test
pressures in excess of 1/2 psi (3.5 kPa) (13.84 in
W.C.). For system tesng at pressures less than or
equal to 1/2 psi (3.5 kPa) (13.84 in W.C.) the
appliance must be isolated from the gas supply
piping by closing its individual manual shuto valve.
You must follow the installaon instrucons and
those in the venng secon for adequate
combuson air and exhaust.
If a water heater is installed in a closed water supply
system, such as one having a backow preventer in
the cold water supply line, means shall be provided
to control thermal expansion. Contact the water
supplier or local plumbing inspector on how to
control thermal expansion.
Should overheang occur or the gas supply fail to
shut o, turn o the manual gas control valve to the
appliance.
Combuson air must be free of chemicals, such as
chlorine or bleach, that produce fumes. These fumes
can damage components and reduce the life of your
appliance.
When installing the Demand Duo 2™, follow these guidelines:
DO NOT
4
DO NOT install the Demand Duo 2™ outdoors.
DO NOT install the Demand Duo 2™ in an area
where water leakage of the unit or connecons will
result in damage to the area adjacent to the system
or to lower oors of the structure. When such
locaons cannot be avoided, it is recommended
that a suitable drain pan, adequately drained, be
installed under the water heaters. The pan must
not restrict combuson air ow.
DO NOT install the Demand Duo 2™ in an area with
negave air pressure.
DO NOT obstruct the ow of combuson and
venlaon air.
DO NOT use the Demand Duo 2™ in an applicaon
such as a pool or spa heater that uses chemically
treated water. The Demand Duo 2™ is suitable for
lling large or whirlpool spa tubs with potable
water.
DO NOT use substute parts that are not
authorized for this system.
DO NOT connect power to the Demand Duo 2™
prior to compleng installaon and the system has
been lled with water.
10 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
# Item
Field
Supplied
Hot Water Outlet
Hot Water Outlet Shut-O
Valve
Cold and Hot Unions
Temperature-Pressure
Relief Valve
Temperature-Pressure
Relief Valve Discharge Pipe
(do not cap, plug or reduce)
Temperature Controller
Pressure Relief Valve
Discharge Pipes (do not
cap, plug, or reduce)
Condensate Discharge Pipe
(must include an air gap)
Gas Control Valve
Gas Union
Cold Water Supply Shut-O
Valve
Cold Water Supply
Thermal Expansion Tank
Non-Tempered Supply Line
Thermostac Mixing Valve
Non-Tempered Return Line
S
Cold water line and expansion tank locaons
are altered for illustrave purposes.
IMPORTANT
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 11
To avoid danger of
suocaon, keep
plasc bags away from babies, small
children and pets. Do not use these bags in
cribs, beds, carriages, or playpens. The bags
are not a toy.
WARNING
119-Gallon Storage Tank
Recovery Pump
Pump Isolaon Valves
Electric Assembly
Recovery Controller Box
The Demand Duo 2™ Commercial Hybrid Water Heang System is packaged and shipped in two separate shipping
boxes. Carefully unpack the shipping boxes and verify the following contents are included.
If any items are damaged or missing, contact your local dealer/distributor or call Rinnai Customer Care at
1-800-621-9419. Do not aempt to use any item that appears damaged.
Rack System with two (2) pre-installed Rinnai
Tankless Water Heaters
Frame Legs (Qty 2)
Water Flex Lines (Qty 2)
12 in. (305 mm)
36 in. (914 mm)
5/16 in.-18 Bolts (Qty 4) (not shown in image)
Securing Bracket
Documentaon:
Demand Duo 2 Commercial Hybrid Water
Heang System Installaon and Operaon
Manual (this manual)
Tankless Water Heater Installaon and
Operaon Manual
Assembled View
119-Gallon Storage Tank
Recovery Controller Box
Recovery Pump
Electric Assembly
Pump Isolaon Valves
2-Unit Tankless
Rack System
Frame Legs (Qty 2)
Assembled View
Securing Bracket
Water Flex Line
36 in. (914 mm)
Water Flex Line
12 in. (305 mm)
12 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
Gather the recommended tools and materials before
starng installaon.
Pipe wrenches (x2)
Phillips Head screwdriver
Adjustable pliers
Wire cuers
Standard zip e (Qty 1) (recommended to
secure the thermistor pipe clamp in place)
Hoisng straps (able to support approximately
220 lb/100 kg)
Gloves
Safety glasses
Level
Soap or gas leak detector soluon
Approved venng
Teon tape (recommended) or pipe
compound
Pipe insulaon
Hammer drill with concrete bits
Saw
Threading machine with heads and oiler
Core drill with diamond head
Torch set
Copper tubing cuer
Steel pipe cuer
Heat tape
5/8 in. ID PVC exible tubing
Electrical wire
Concrete wall anchors
Oponal pipe cover
PVC glue/cement and primer
2 conductor 22 AWG wire for controller
Single gang electrical box
Wire nuts
Unions and drain valves
Drain pan
Earthquake strap
Contaminant Maximum Level
Total Hardness Up to 200 mg/L
Aluminum * Up to 0.2 mg/L
Chlorides * Up to 250 mg/L
Copper * Up to 1.0 mg/L
Dissolved Carbon Dioxide (CO2) Up to 15.0 mg/L
Iron * Up to 0.3 mg/L
Manganese * Up to 0.05 mg/L
pH * 6.5 to 8.5
TDS (Total Dissolved Solids) * Up to 500 mg/L
Zinc * Up to 5 mg/L
When selecng an installaon locaon, you must ensure
that clearances will be met and that the vent length will
be within required limits. Consider the installaon
environment, water quality, and need for freeze
protecon. Requirements for the gas line, water lines,
electrical connecon, and condensate disposal can be
found in their respecve secons in this manual.
For vent terminaon clearances, refer to the Tankless
Water Heater Installaon and Operaon Manual
supplied with the Demand Duo 2™ system.
* Source: Part 143 Naonal Secondary Drinking
Water Regulaons
This secon provides informaon on the importance of
water quality to the Rinnai Tankless Water Heater. The
informaon is intended to serve as general guidelines
only and is not a complete list of water quality
guidelines.
Consideraon of care for your water heater should
include evaluaon of water quality. The water must be
potable, free of corrosive chemicals, sand, dirt, or other
contaminants. It is up to the installer to ensure the
water does not contain corrosive chemicals or elements
that can aect or damage the Rinnai Tankless Water
Heater. Water that contains chemicals exceeding the
levels below can damage the Rinnai Tankless Water
Heater. Replacement of components due to water
quality damage is not covered by the warranty.
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 13
Air surrounding the water heater, venng, and vent
terminaon(s) is used for combuson and must be free
of any compounds that cause corrosion of internal
components. These include corrosive compounds that
are found in aerosol sprays, detergents, bleaches,
cleaning solvents, oil based paints/varnishes, and
refrigerants. The air in beauty shops, dry cleaning stores,
photo processing labs, and storage areas for pool
supplies oen contains these compounds. Therefore, it is
recommended that external (outdoor) models be used
for these locaons where possible. In applicaons
ulizing room air where there are high levels of
parculates, Rinnai oers a room air screen. The water
heater, venng, and vent terminaon(s) should not be
installed in any areas where the air may contain these
corrosive compounds.
If you install the Demand Duo 2™ in an area that is
known to have hard water or that causes scale build-up,
the water must be treated and may require a more
frequent ushing schedule.
This water heater includes a service indicator (Service
Soon, SS). When selected in the parameter sengs, an
SS code will display on the controller indicang that it is
me to ush and service the water heater. Scale build-up
is caused by hard water and can be accelerated if the
water heater is set at a high temperature.
Rinnai oers Southeastern Filtraons ScaleCuer
Water Condioning Systemthat oers superior lime
scale prevenon and corrosion control by feeding a
blend of control compounds into the cold water supply.
Locaon Clearance
Top of tank
12 in. (305 mm)
0 in. from vent components
Clearance for servicing the
anode rods is 54 in. (1,372 mm)
from top of water heater
Boom (Ground) 0 in.
Back of tank 0 in.
Front of tankless
water heaters
0 in.
Clearance for servicing is 24 in.
(610 mm)
Sides (Le and
Right) of tankless
water heaters
2 in. (51 mm)
12 in. (305 mm)
2 in. (51 mm)
24 in. (610 mm)
14 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
1. Choose the right hand truck to support the weight
and size of the water heater. Refer to the
Specicaons secon in this manual for specic
weights and dimensions.
2. Use proper liing techniques to load the tank onto
the hand truck:
Posion the tank onto the hand truck so the
weight is evenly balanced and the tank is
touching the rails of the hand truck.
Secure the water heater to the hand truck:
Posion STRAP A around the top of the tank as
illustrated below.
Posion STRAP B around the base of the tank
below the pump assembly.
Strap A
Strap B
Products installed in the state of California must be
braced, anchored, or otherwise secured to avoid moon
or falling during an earthquake. Contact the California
Oce of the State Architect located at 1102 Q Street,
Suite 5100, Sacramento, CA 95811 for instrucons.
NOTICE
STRAP
STRAP
Posion straps around the tank per the requirements
of California Oce of the State Architect. DO NOT
POSITION THE STRAPS OVER PUMP, PIPE, FITTINGS
OR WIRE.
IMPORTANT
5
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 15
When posioning the tank and connecng water, follow these guidelines:
Water connecons to the Demand Duo 2™ must follow all state and local plumbing codes.
When assembling the hot and cold water piping, use a high quality food grade pipe joint compound and ensure all
ngs are ght.
DO NOT apply an open ame to the inlet and outlet ngs, as heat will damage or destroy the plasc lined ngs.
This will result in premature failure of the ngs, which is not covered by the warranty.
For standard installaons, refer to the Piping Diagram for Basic Installaons in the Appendix.
To posion the tank and connect water:
1. Posion the tank in the desired locaon.
2. Connect piping to the cold water inlet connecon (1.5 in./38 mm MNPT). See A in image below.
Keep the pipe as close as possible to one side of the tank; this allows the rack frame to posion closer to the
tank and allow for easier ex line connecon (see B).
Maximum pipe length from the cold water inlet connecon to the rack frame leg is 17.77 in. (451 mm) (see C).
3. Connect piping to the hot water outlet connecon (1.5 in./38 mm MNPT) (see D).
4. Install a shut-o valve on the cold and hot water lines (see E).
5. Rinnai recommends to install unions on the cold and hot water lines so that the water heater can easily disconnect
if servicing is required (see F).
17.77 in.
(451 mm)
MAXIMUM
C
B
Keep pipe close to tank
F
F
E
E
A
D
16 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
1. Lay the rack assembly down on the shipping pallet.
2. Posion the frame legs
(supplied) on each rack leg so
that the threaded inserts are
centered over the open slots.
3. Use the supplied 4 bolts
(5/16 in. - 18) to fasten the
frame legs to the rack legs.
Frame leg
Threaded
inserts
To install the rack frame legs:
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 17
1. Loop hoisng straps (eld-supplied) around the rack top frame. Straps should support approximately 220 lb (100 kg).
2. Posion the rack in front of the tank, and then gently push the rack back as close to the tank as possible so that the
ex lines can connect the two assemblies.
Push rack back close to tank
Place rack in front of tank
17.77 in. (451 mm)
Loop hoisng straps around rack top frame.
To posion the rack:
18 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
1. Connect the 12 in. (305 mm) ex line
from the cold water manifold to the
threaded connecon on top of the
pump. Tighten to 25-lb torque.
Ensure the gasket is in the ex line.
2. Connect the 36 in. (914 mm) ex line from
the hot water manifold to the threaded
connecon at the top of the tank. Tighten to
25 -lb torque.
12 in. (305 mm) ex line
Threaded connecon on
top of pump
Cold water manifold
36 in. (914 mm) ex line
Hot water manifold
Threaded connecon
at top of tank
To install ex lines:
Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual 19
Connect the external controller thermistor to the 36 in. hot water ex line.
IMPORTANT: A zip e is recommended to secure the thermistor pipe clamp in place.
Thermistor connected to
36 in. hot water ex line.
Thermistor
To connect the thermistor:
20 Demand Duo™ 2 Commercial Hybrid System Installaon and Operaon Manual
1. The rack system must be anchored and
secured in accordance with naonal and/
or local codes having jurisdicon.
Base holes to secure the rack are 0.5 in.
(13 mm) in diameter. Reference local
codes regarding minimum concrete
thickness and use appropriate expansion
anchors that are capable of supporng
the rack system weight of approximately
220 lb (100 kg). Reference and follow the
anchor manufacturers use and
installaon requirements.
Boom View
2. Place the securing bracket on top of
the tank and over the frame of the
rack.
3. Using (4) self-drilling screws, aach the
securing bracket to the top of the tank.
To secure the rack:
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Rinnai CHS398100CUiP Operating instructions

Category
Water heaters & boilers
Type
Operating instructions
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